Fix minor format error in exception message

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1310963 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/layoutmgr/AbstractBreaker.java

@@ -752,7 +752,7 @@ public abstract class AbstractBreaker {
         Position positionAtBreak = elementAtBreak.getPosition();
         if (!(positionAtBreak instanceof SpaceResolver.SpaceHandlingBreakPosition)) {
             throw new UnsupportedOperationException(
-                    "Don't know how to restart at position" + positionAtBreak);
+                    "Don't know how to restart at position " + positionAtBreak);
         }
         /* Retrieve the original position wrapped into this space position */
         positionAtBreak = positionAtBreak.getPosition();